Textiles: knitting – Needles
Patent
1994-11-30
1996-08-20
Calvert, John J.
Textiles: knitting
Needles
66115, 66123, D04B 1500
Patent
active
055467709
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to knitting parts such as a guide, needle, tongue, sinker, separator, jacquard guide needle and the like which have a portion contacting with knitting yarn when the parts are fitted to a knitting machine to perform knitting, and particularly to surface covering technology to improve the durability of such parts.
2. Description of the Related Art
The present invention will be described using a warp knitting machine as an example, though knitting machines may include a warp-, flat- and circular knitting machine and the like, and similarly it can be applied to such a flat- or circular machine.
The warp knitting machine is roughly classified into tricot and raschel machines, on which a sectional beam wound with knitting yarn or warp end is usually mounted, the warp end being supplied therefrom to a knitting needle line to perform knitting.
The knitting parts (tool) consisting of a knitting section of a warp knitting machine comprise a thin sheet formed "guide" of about 200 .mu.m thick which is located between a sectional beam and a knitting needle line and has a hole to guide knitting yarn or warp end, a thin sheet-formed "needle" with a hook on a head end for knitted stitch formation, and a thin sheet-formed "tongue", which cooperatively participates in the knitted stitch formation together with the needle, and "sinker", as well as "separator", "jacquard guide needle", etc., in general, a number of such parts being arranged parallel at very close spaces to form a block.
Generally, from viewpoints of easy processing and wear resistance, a carbon steel base material shaped to profile each of these parts is coated by means of wet chromium plating and used as various knitting parts described above.
The durability of such knitting parts, however, has been in serious question due to speeding up of knitting machines, diversification of materials for knitting yarn such as high strength fibers or modified fibers and employment of various kinds of sizes.
Namely, the knitting parts such as the guide, needle, tongue, sinker, separator, jacquard guide needle, etc. tend to be worn out at the portion contacting with the knitting yarn, which would cause hairiness or end breakage of the yarn, and thus the durability of such parts is an important factor in deciding the operational effectiveness of machines and the cost of products because it requires a great deal of expense, effort and time to replace a great number of these parts used in a machine so as to prevent such a trouble of the yarn described above.
It has been proposed to coat the surface of knitting parts (tool) for warp knitting machines with high hardness covering of metals such as tantalum (Ta), tungsten (W), titanium nitride(TiN), titanium-tungsten alloy (TiW), etc. (see Japanese Laid-Open Patent No. 4-41,755).
It has also been known, however, that wearing of knitting parts typically represented by the needle or guide is a phenomenon caused by kinds of fibers, impact pressure, vibration characteristics, etc., and that satisfied results are not necessarily obtained by a covering of high surface hardness.
In fact, in the case of a needle or guide covered with titanium nitride which is known as a covering of a high hardness compound, no increase in durability was observed, compared with a conventional one covered by means of chromium plating on a surface of carbon steel base material, and caused a problem in that the substrate was softened due to a higher treating temperature.
Further, it is also reported that the toughness of a base material itself is lost and, as a result, durability is decreased on the contrary when a covering of high hardness is thickly formed on the base material. From this point of view, it is necessary to improve the durability without spoiling inherent properties of the base material.
Upon this, the inventors have confirmed it effective to form a hard carbon film covering on a surface of base material of knitting parts of knitting machine such as a needle, guide a
REFERENCES:
patent: 3882695 (1975-05-01), Flicker
patent: 5077990 (1992-01-01), Plath
Calvert John J.
Citizen Watch Co. Ltd.
LandOfFree
Knitting parts of knitting machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Knitting parts of knitting machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Knitting parts of knitting machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2322193